“The percentage of people who bother to complain is very small so I think you could be confident that this behaviour affected tens of thousands, if not hundreds of thousands.”

Federal Court Justice Stephen Burley has found Viagogo failed to clearly state its booking fees between May and June 2017.

Examples raised in court included a Victorian woman who was charged $104.98 in fees when she booked two tickets to a theatre show, as well as several similar cases for fans buying tickets to the Australian Open tennis, Ashes Test cricket matches and concerts.

Mr Sims wants the Federal Court ruling to send a message throughout the industry.

“If their behaviour doesn't change sufficiently, they'll be back in court again,” he said.

Viagogo insists the ruling does not reflect the reality of its ticketing platform today.